[Swift-devel] Is there a site count limit?

[Mihael Hategan]

On Fri, 2009-04-10 at 12:00 -0500, Michael Wilde wrote:
> They are in ci:/home/wilde/oops.1063.2
> 
> I spotted the anomaly (if thats what it is) as below.
> 
> Also: we discussed on the list way way back how to get the swift 
> scheduler to send no more jobs to each "site" than there are cores in 
> that site (for this bgp/falkon case) so that jobs dont get committed to 
> busy sites while other sites have free cores.
> 
> In this run, we are trying to send 32K jobs to 32K cores.
> Each of the 128 "sites" have 256 cores.
> 
> The #s below show about 19K of those jobs as having been dispatched to 
> 32*256 = 8192 cores.

That is if all the cores are the same. In this case it seems that only
8192 cores are the same. I'll investigate why.

> 
> int$ grep JOB_START *nr3.log | awk '{print $19}' | sort | uniq -c 
> 
>       24
>      365 host=bgp000
>      790 host=bgp001
>      371 host=bgp002
>      383 host=bgp003
>      365 host=bgp004
>      791 host=bgp005
>      415 host=bgp006
>      775 host=bgp007
>      790 host=bgp008
>      791 host=bgp009
>      369 host=bgp010
>      790 host=bgp011
>      359 host=bgp012
>      791 host=bgp013
>      394 host=bgp014
>      402 host=bgp015
>      358 host=bgp016
>      595 host=bgp017
>      790 host=bgp018
>      790 host=bgp019
>      791 host=bgp020
>      790 host=bgp021
>      370 host=bgp022
>      790 host=bgp023
>      790 host=bgp024
>      674 host=bgp025
>      567 host=bgp026
>      389 host=bgp027
>      778 host=bgp028
>      366 host=bgp029
>      787 host=bgp030
>      695 host=bgp031
> int$ pwd
> 
> 
> On 4/10/09 11:42 AM, Mihael Hategan wrote:
> > On Fri, 2009-04-10 at 11:38 -0500, Michael Wilde wrote:
> >> Hi,
> >>
> >> We're trying to run an oops run on 8 racks of the BGP. Its possible this 
> >> is larger than has been done to date with swift.
> >>
> >> Our sites.xml file has localhost plus 128 Falkon sites, one for each 
> >> pset in the 8-rack partition.
> >>
> >>  From what I can tell, Swift sees all 128 sites, but only sends jobs to 
> >> exactly the first 32, bgp000-bgp031.
> >>
> >> While I debug this further, does anyone know of some hardwired limit 
> >> that would cause swift to send to only the first 32 bgp sites?
> > 
> > I can't think of anything that would make that the case. The sites file
> > and a log would be useful.
> >